Question

Exercises
to the most appropriate answer
1.Which of the following is a correct word equation?
A.carboxygen + carbon dioxide
b. magnesium oxide + oxygen magnesium
carbon oxygen carbon dioxide
d none of these
2.What changes happen when chemical reactions occur?
evolution of a gas
A.change in colour
b.formation of a precipitate
C.Evolution of a gas
d. all of these
3.Which gas is produced when copper(ll) carbonate is heated?
A.hydrogen
b.oxygen
C.carbon dioxide d. none of these
4.When quick lime is added to water, which of the following does not happen?
A.Heat is evolved
b. Light is produced.
C.Heat is absorbed
d. Carbon dioxide is produced.
5.When potassium lodide and lead acetate solutions are mixed, what colour is the precipitate formed?
A.White
b green
c yellow
d. red
6.When hydrogen gas is bubbled through molten sulphur, which gas is formed?
A.Carbon dioxide
b. hydrogen sulphide
C. sulphur dioxide
d. nitrogen
please answer correctly and give answer fast​

Answer 1

Explanation:

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